<?php 
  $usename='lsk';
  $psw=12232;
  echo "hello world";
  echo $usename;
  echo '<br>';

  var_dump($psw);
  $chinese=60;
  $sx=80;
  $total=$chinese+$sx;
  echo "语文成绩为 $chinese ，数学成绩为 $sx ，总成绩为:".($chinese+$sx);
  $n1=10;
  ++$n1;
  echo $n1;
?>